diff --git a/data/bc.task.spatial.rda b/data/bc.task.spatial.rda
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diff --git a/data/costiris.task.rda b/data/costiris.task.rda
index 2e3d0598e5..979d558d23 100644
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diff --git a/data/gunpoint.task.rda b/data/gunpoint.task.rda
index fe0396e682..22da2a9081 100644
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diff --git a/data/lung.task.rda b/data/lung.task.rda
index 3e3c8cbab3..064674e955 100644
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diff --git a/data/phoneme.task.rda b/data/phoneme.task.rda
index 4ff4c4fe25..50c88f96b0 100644
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diff --git a/data/wpbc.task.rda b/data/wpbc.task.rda
index 1dcab5e913..950607f544 100644
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diff --git a/data/yeast.task.rda b/data/yeast.task.rda
index d5e4cf1f91..f2e59e108c 100644
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diff --git a/tests/testthat/test_base_checkData.R b/tests/testthat/test_base_checkData.R
index 01d0bbe623..781179231b 100644
--- a/tests/testthat/test_base_checkData.R
+++ b/tests/testthat/test_base_checkData.R
@@ -46,3 +46,16 @@ test_that("checkData", {
   colnames(df)[1] = "aaa"
   expect_error(makeClassifTask(data = df, target = multiclass.target), "Unsupported feature type")
 })
+
+test_that("changeData . getTaskData is a noop on builtin tasks", {
+  # We expect changeData(task, getTaskData(task, ...)) to not change task.
+  # If it does, it means that the internal format of task or task.desc has
+  # changed, and that the data needs to be re-generated.
+  pkgdata = data(package = "mlr")$results[, "Item"]
+  tasknames = grep("\\.task$", pkgdata, value = TRUE)
+  for (task in tasknames) {
+    taskdata = get(task)
+    changeddata = changeData(taskdata, getTaskData(taskdata, functionals.as = "matrix"))
+    expect_equal(taskdata, changeddata)
+  }
+})